Hi, I bought a set of new style 18" RS4 Replicas last year and they came with crappy centre caps that are just Audi stickers on a rubbish plastic cap. Been meaning to find decent ones for ages but never got round to it. So got a £10 off voucher from eBay so thought I might as well. I've been looking all over ebay and don't know which size I should be going for? I've measured the diameter of the outside of my caps and its 68mm, but on many auction listings they give a different outside and inside diameter. I don't want to take my wheels off to just look at the centre caps because I'm planning to buy all the centre caps and take the wheels off then because I need to check a few other things and i'm going to do it all in one go. Also if anyone's got the correct ones for sale I'd be very grateful? So yeah any help would be awesome. Cheers in advance.